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All answers having "Ward (off)" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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FEND

STAY



5 Character Answers:

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AVERT

DETER

PARRY

REPEL

STAVE

SWEAT



6 Character Answers:

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THWART



7 Character Answers:

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ELEMENT



9 Character Answers:

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ANIMOSITY